US10744973B2 - Belt retractor - Google Patents
Belt retractor Download PDFInfo
- Publication number
- US10744973B2 US10744973B2 US15/757,996 US201615757996A US10744973B2 US 10744973 B2 US10744973 B2 US 10744973B2 US 201615757996 A US201615757996 A US 201615757996A US 10744973 B2 US10744973 B2 US 10744973B2
- Authority
- US
- United States
- Prior art keywords
- sensor
- idler arm
- belt
- belt retractor
- ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 238000013016 damping Methods 0.000 claims abstract description 19
- 238000000605 extraction Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 239000002184 metal Substances 0.000 description 5
- 230000000284 resting effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 241001012508 Carpiodes cyprinus Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/405—Belt retractors, e.g. reels self-locking in an emergency responsive to belt movement and vehicle movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R2022/3402—Retractor casings; Mounting thereof
Definitions
- the invention relates to a belt retractor for a vehicle seat belt.
- Belt retractors comprise a vehicle-sensitive locking system usually provided with a sensor which normally includes, as an inertia mass, a metal ball which is movably supported in a shell fixed to the housing.
- a sensor lever which is pivoted to a housing and is swiveled about its pivot bearing by the movement of the metal ball rests on the metal ball.
- the end thereof enters the path of motion of control teeth at the periphery of a control disk arranged on the belt reel so as to be rotatable to a limited extent. In this way the control disk is locked so that a relative rotation occurs between the control disk and the belt reel. Said relative rotation is exploited to move a locking blade pivoted to a frame of the belt retractor into locking engagement with locking teeth being associated with the belt reel.
- belt retractors For reducing said disturbing noise use is made of belt retractors including an idler arm which is coupled to the belt reel via a friction coupling and prevents the metal ball from deflecting.
- belt retractor is known, for example, from DE 10 2006 037 544 A1.
- a belt retractor for a vehicle seat belt comprising a frame, a belt reel rotatably supported in the frame, a shell and a sensor for vehicle-sensitive locking which includes a sensor lever.
- the belt retractor comprises an idler arm contacting a sensor and being adjustable between an initial position in which the sensor lever is locked and an extracting position in which the sensor lever is released, wherein the idler arm interacts with a damping element the damping characteristics of which are speed-sensitive.
- the quasi-static operating state comprises a range reaching from no belt movement to a belt extraction rate which is lower than a predetermined webbing extraction rate resulting in locking of the webbing.
- such damping element the damping characteristics of which are speed-sensitive is a rotational damper containing a viscous medium for damping the movement of rotation.
- the structural-viscous characteristics of the medium require a speed-sensitive torque.
- the belt retractor according to the invention preferably comprises a return spring which applies a restoring force to the idler arm for returning the idler arm after deflection to the initial position again and which is preferably adjacent to the shell.
- the idler arm is ensured to return, after being deflected, to its initial position in which it locks the sensor lever and thus ensures noise suppression.
- the belt retractor comprises a return spring which is adjacent to the shell and via the idler arm exerts a force on the sensor that is sufficient to suppress movement of the sensor at a belt extraction rate lower than a predetermined webbing extraction rate resulting in locking of the webbing.
- the sensor is prevented from moving and causing disturbing noise in the quasi-static operating state.
- the idler arm contacts the sensor only locally and releases the sensor as soon as the idler arm is moving away.
- the idler arm is prevented from interfering with the tip of the sensor so that the belt retractor satisfies the FMVSS or AK-LV specification.
- the rotational damper may be coupled to the belt reel so as to be rotationally driven.
- the rotational damper may be coupled to the belt reel also via a gearing. In this way, it is possible to specifically design the coupling and to bring the rotational damper to an appropriate rotational speed which is optimal for damping.
- the rotational damper is positioned between the belt reel and the idler arm so that upon rotation at a predetermined rotational speed the belt reel moves the idler arm away from the sensor via the rotational damper. In this way, the idler arm is prevented from locking the sensor in the dynamic operating state and an emergency latching is possible.
- the gearing may comprise a toothed ring in the external teeth of which the rotational damper engages via a pinion. In this way, any rotational movement inside the gearing is detected by the rotational damper.
- the gearing comprises a toothed ring in the internal teeth of which the belt reel engages via a planetary wheel.
- the senor is a ball sensor and the idler arm is preferably adjacent to the sensor lever resting on a ball so that a conventional sensor may be used.
- the rotational damper comprises a housing, a rotor as well as a packing and is filled especially with silicone oil.
- FIG. 1 shows a belt retractor according to the invention in a perspective view
- FIG. 2 shows a shell including a sensor unit disposed therein for vehicle-sensitive locking of a belt retractor according to the invention in an exploded view
- FIG. 3 shows a side view of the shell and the sensor unit disposed therein of a belt retractor according to the invention
- FIG. 4 shows a sectional view of a rotational damper of a belt retractor according to the invention.
- Belt retractors for vehicle seat belts are basically known. Also, the basic structure of the locking system for vehicle-sensitive locking of the belt reel of the belt retractor is known. Therefore, the structure and the function of the belt retractor and of the locking system will be described here only so far as this is required for the comprehension of the invention.
- FIG. 1 illustrates a belt retractor 10 comprising a housing including a frame 12 , a belt reel 14 rotatably supported in the frame 12 and a shell 16 arranged on the outside of the frame 12 for accommodating the sensor unit for locking the belt reel.
- FIG. 2 illustrates the shell 16 comprising a sensor unit for vehicle-sensitive locking of the belt reel 14 in an exploded view.
- Said sensor unit comprises a ball sensor 18 for vehicle-sensitive locking which includes a sensor lever 20 resting on a movable ball 19 as well as an idler arm 22 which contacts the sensor 18 .
- a return spring 24 and a rotational damper 26 are arranged on the idler arm 22 .
- the rotational damper 26 includes, at its outside, a pinion 28 which together with a toothed ring 30 and a planetary wheel 32 is part of the gearing 34 .
- FIG. 3 illustrates, in a side view, the arrangement of the sensor unit shown in FIG. 2 within the shell 16 .
- the sensor 18 which, as afore-mentioned, is a ball sensor in this case is locked by the idler arm 22 , as the latter is locally adjacent to the sensor lever 20 resting on the ball 19 .
- the contact point preferably is the uppermost point of the idler arm 22 in the mounted state.
- the return spring 24 contacting the idler arm 22 and the shell 16 applies a restoring force which maintains the idler arm 22 in contact with the sensor 18 and exerts a predetermined force on the same to the idler arm 22 .
- a torsion or leaf spring applies a restoring force which maintains the idler arm 22 in contact with the sensor 18 and exerts a predetermined force on the same to the idler arm 22 .
- the idler arm 22 is torque-coupled to the gearing 34 via the rotational damper 26 .
- the movement of rotation of the belt reel 14 is transmitted via the planetary wheel 32 which is supported within the shell 16 and is in mesh with the internal teeth of the toothed ring 30 to the rotational damper 26 including the pinion 28 which engages in the external teeth of the toothed ring 30 . In this way, any movement inside the gearing 34 is detected and damped by the rotational damper 26 .
- the belt retractor 10 In the case of a belt movement the belt extraction rate of which is lower than a predetermined webbing extraction rate resulting in locking of the webbing, the belt retractor 10 is provided in the quasi-static operating state. In said operating state, the torque acting on the idler arm 22 is not sufficient to overcome the restoring force of the return spring 24 . Hence, the idler arm 22 is retained in its initial position in which the sensor lever 20 is locked and presses against the ball 19 , thus suppressing disturbing noise.
- the belt retractor 10 In the case of a belt movement the webbing extraction rate of which is above a predetermined value, the belt retractor 10 is provided in the dynamic operating state. In this case, the torque acting on the idler arm 22 is so high that the idler arm 22 locally contacting the sensor 18 moves away from the latter into an extracting position, thus causing the sensor lever 20 to be released and a potential emergency latching to be admitted.
- the return spring 24 ensures that the idler arm 22 returns from the extracting position to its initial position again.
- the idler arm 22 does not interfere with the tip of the sensor 18 but contacts the sensor 18 merely locally.
- the sensor 18 has to be released as soon as the idler arm 22 is moving.
- the rotational damper 26 is illustrated in a sectional view. It comprises, for example, a rotor 40 which is supported so as to rotate in a housing 36 which is filled with structural-viscous medium 38 , preferably with silicone oil, and which is sealed by a cover with the aid of a packing.
- a shaft to which the pinion 28 is integrally formed or coupled is provided on the rotor 40 .
- Both on the rotor 40 and on the housing 36 extensions 42 , 44 protruding into the interior of the rotational damper are integrally formed, said extensions engaging in each other and constituting resistances for the medium 38 when the extensions 42 , 44 are rotating relative to each other.
- the rotor 40 is driven by the gearing 34 via the pinion 28 .
- the structural-viscous medium 38 is entrained only in the vicinity of the extensions 42 , while the laminar flow in the radial direction decreases with the distance from the extensions 42 and the interaction with the extensions 44 is relatively small.
- the degree of interaction between the laminar flow and the extensions 44 increases so that in the case of high speeds of the rotor 40 a higher torque is transmitted to the housing 36 .
- This flow of a viscous fluid occurring between two coaxial cylinders rotating relative to each other is also known as Couette flow.
Abstract
Description
Claims (14)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015011668.1 | 2015-09-11 | ||
DE102015011668.1A DE102015011668B3 (en) | 2015-09-11 | 2015-09-11 | retractor |
DE102015011668 | 2015-09-11 | ||
PCT/EP2016/067709 WO2017041953A1 (en) | 2015-09-11 | 2016-07-26 | Belt retractor |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180236969A1 US20180236969A1 (en) | 2018-08-23 |
US10744973B2 true US10744973B2 (en) | 2020-08-18 |
Family
ID=56550237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/757,996 Active 2037-03-14 US10744973B2 (en) | 2015-09-11 | 2016-07-26 | Belt retractor |
Country Status (4)
Country | Link |
---|---|
US (1) | US10744973B2 (en) |
CN (1) | CN108136997B (en) |
DE (1) | DE102015011668B3 (en) |
WO (1) | WO2017041953A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015004972B4 (en) * | 2015-04-20 | 2019-12-24 | Trw Automotive Gmbh | retractor |
CN109177915A (en) * | 2018-09-14 | 2019-01-11 | 延锋汽车智能安全系统有限责任公司 | Seat belt retractor and safety belt assembly |
CN109177916A (en) * | 2018-09-14 | 2019-01-11 | 延锋汽车智能安全系统有限责任公司 | Seat belt retractor and safety belt assembly |
US20210002939A1 (en) * | 2019-07-02 | 2021-01-07 | Illinois Tool Works Inc. | Reel damper |
CN215850873U (en) * | 2021-04-09 | 2022-02-18 | 宝钜瑞士股份有限公司 | Automobile safety seat and automatic safety belt adjusting device thereof |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3418378A1 (en) | 1984-05-17 | 1986-02-13 | Britax-Kolb GmbH & Co, 8065 Erdweg | Belt retractor for vehicle safety belts |
EP0359960A2 (en) | 1988-09-19 | 1990-03-28 | Trw Repa Gmbh | Device for immobilising an inertia lever in a safety belt reel |
DE9005829U1 (en) | 1989-08-03 | 1990-07-26 | Autoliv-Kolb Gmbh & Co, 8060 Dachau, De | |
DE102006037544A1 (en) | 2006-08-10 | 2008-02-14 | Trw Automotive Gmbh | Belt roller with vehicle-sensitive blocking system, includes ganged control lever coupled via friction coupling to belt coil |
US20080135665A1 (en) * | 2005-06-24 | 2008-06-12 | Autoliv Development Ab | Seat-belt retractor |
WO2012003909A1 (en) | 2010-07-08 | 2012-01-12 | Autoliv Development Ab | Safety belt retractor having an inclination-adjustable vehicle-sensitive inertia sensor |
US20150001331A1 (en) * | 2012-01-18 | 2015-01-01 | Trw Automotive Gmbh | Belt retractor with a recoil brake |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08133009A (en) * | 1994-11-04 | 1996-05-28 | Keihin Seiki Mfg Co Ltd | Seat belt device |
JP2013002539A (en) * | 2011-06-15 | 2013-01-07 | Nifco Inc | Rotary damper |
JP2015150902A (en) * | 2014-02-10 | 2015-08-24 | 芦森工業株式会社 | Retractor for seat belt |
-
2015
- 2015-09-11 DE DE102015011668.1A patent/DE102015011668B3/en active Active
-
2016
- 2016-07-26 WO PCT/EP2016/067709 patent/WO2017041953A1/en active Application Filing
- 2016-07-26 US US15/757,996 patent/US10744973B2/en active Active
- 2016-07-26 CN CN201680059184.6A patent/CN108136997B/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3418378A1 (en) | 1984-05-17 | 1986-02-13 | Britax-Kolb GmbH & Co, 8065 Erdweg | Belt retractor for vehicle safety belts |
EP0359960A2 (en) | 1988-09-19 | 1990-03-28 | Trw Repa Gmbh | Device for immobilising an inertia lever in a safety belt reel |
DE9005829U1 (en) | 1989-08-03 | 1990-07-26 | Autoliv-Kolb Gmbh & Co, 8060 Dachau, De | |
US20080135665A1 (en) * | 2005-06-24 | 2008-06-12 | Autoliv Development Ab | Seat-belt retractor |
DE102006037544A1 (en) | 2006-08-10 | 2008-02-14 | Trw Automotive Gmbh | Belt roller with vehicle-sensitive blocking system, includes ganged control lever coupled via friction coupling to belt coil |
WO2012003909A1 (en) | 2010-07-08 | 2012-01-12 | Autoliv Development Ab | Safety belt retractor having an inclination-adjustable vehicle-sensitive inertia sensor |
US20150001331A1 (en) * | 2012-01-18 | 2015-01-01 | Trw Automotive Gmbh | Belt retractor with a recoil brake |
Also Published As
Publication number | Publication date |
---|---|
DE102015011668B3 (en) | 2017-03-16 |
CN108136997A (en) | 2018-06-08 |
US20180236969A1 (en) | 2018-08-23 |
WO2017041953A1 (en) | 2017-03-16 |
CN108136997B (en) | 2021-09-17 |
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